JPS6155813B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a busy line search in a mobile communication system.

In general, in subscriber line switching systems, if a busy failure occurs in a subscriber, that subscriber is unable to make or receive calls. In this case, a busy line search function is provided in order to conduct a busy test of the subscriber's line in order to find the fault based on the subscriber's report. On the other hand, in the mobile communication system as well, a function to search for the radio line on which the mobile device is talking is required for the busy test based on the subscriber's declaration.

For this reason, there is a demand for the addition of a search function that can transmit search information from any switching center and search for a wireless line on which any mobile device is talking.

Conventionally, when searching for a busy line, the search for a subscriber line has generally been performed based on the subscriber number.

As is well known, in the subscriber line switching system,
Since subscriber lines are fixedly housed in exchanges,
There is a unique relationship between the subscriber number, the switching center, and the housing location of the subscriber line.

Therefore, when searching for a busy line, the exchange where the subscriber is accommodated and the subscriber line can be uniquely determined from the subscriber number.

However, in mobile communications, each service area has multiple mobile switching control stations (hereinafter referred to as switching stations) and radio stations that have interfaces with the switching stations, and mobile terminals can Since the mobile device moves between service areas, the switching center that has the call interface within the service area where the mobile device is located is undefined. In addition, the wireless line, which corresponds to a subscriber line in a subscriber line switching system, is generally shared by a large number of mobile devices in order to make effective use of it, and a method is adopted in which line concentrator switches are distributed among the mobile devices. Assigned in an unspecified manner.

Therefore, there is no relationship between the subscriber number of the mobile device, the switching center with which the mobile device has a call interface, and the radio line through which the mobile device is communicating. Therefore,
When searching for a busy line, it is not possible to unambiguously determine from the subscriber number the exchange with which the mobile device has a call interface and the radio line on which the mobile device is making a call.

An object of the present invention is to provide, in a mobile communication system having the above-mentioned special characteristics, a system that automatically searches for a radio line on which a mobile device is making a call from an arbitrary switching center.

The purpose of the above is to index the location information from the subscriber number of the mobile device at the switching center that receives the search request based on the mobile device number, and to search for the service area where the mobile device is located. A means for determining a representative exchange to enter, a means for requesting a search to be sent to the representative exchange, a means for searching for its own exchange, a means for requesting a search for all exchanges within its own service area, and a search result. The return of the search request is achieved by providing means for transmitting the search request to the exchange that received the search request via the representative exchange.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a model diagram of a mobile communication system.

2 and 3 are relay connection diagrams between a switching center and a wireless station in a busy line search method showing an embodiment of the present invention.

In FIG. 1, a switching center 1, a switching center 2, and a switching center 3 are installed in a service area 7, and each switching center has radio stations 11 to 1n, radio stations 21 to 2n, and radio stations 31 to 3. 3n has an interface.

Similarly, in the service area 8, 4, 5.6 are switching stations, and 41 to 4n, 51 to 5n, and 61 to 6n are wireless stations. The connections between each switching center include speech lines and data lines. Reference numeral 9 denotes a mobile device having an interface and communicating with a wireless station 51 within the service area 8.

In this embodiment, since the mobile device 9 moves in any service area, the location information and subscriber data of the mobile device necessary for the call connection sequence process are stored in a specific switching center 5 (referred to as a home memory station). ing. As this location information, the number of the service area 8 is stored.

FIG. 2 is a system diagram for searching for the wireless line on which the mobile device 9 is talking based on the subscriber number of the mobile device 9 received from the switching center 1 in FIG. This shows a case where the service areas 8 are different.

FIG. 3 is a system diagram when the search request service area and the service area where the mobile device is located are the same.

An embodiment of the busy line search method according to the present invention will be described with reference to FIGS. 2 and 3.

In Fig. 2, there are service area 7 and service area 8, but in the search using this method, the search range does not include exchanges in all service areas,
Limited to exchanges within the service area where the mobile device is located. In other words, the search range is set to service area 8.
This is limited to exchange 4, exchange 5, and exchange 6 within the area.

Since the receiving exchange 1 belongs to the service area 7, it makes a search request to the exchanges 4 in the service area 8. (Hereinafter referred to as search request control) Upon receiving the request, the exchange 4 becomes the representative exchange within the service area 8 and performs search control within its own service area.

In other words, it requests its own station's wireless line search process and the other exchanges 5 and 6 to perform a wireless line search process, and sends the search results to the receiving exchange 1 via its own station 4, which is the representative exchange. Send it back.

The search request control at the receiving exchange 1 and the search control at the representative exchange 4 will be explained below in order.

First, when the switching center 1 receives the subscriber number of the mobile device 9, it sends the subscriber number to the switching center 5, which is the home memory station of the mobile device 9, in order to confirm the service area of the mobile device 9. Create and send out a readout signal for the included location information (service area number),
Position information is read from the exchange 5 via the data line. The exchange 1 compares the number 8 of the service area it has read with the number 7 of the service area to which it belongs, and finds that it is different from the number 7 of the service area to which it belongs, so the number 8 of the service area it is in is changed. The representative exchange center is determined in order to make a search request to. Note that from the switching center 1 belonging to the service area 7, the service area is limited to the service area of the adjacent service area for ease of search test and economic efficiency. When determining the representative exchange, exchange 4 is determined by indexing the memory that stores the number of the service area corresponding to the service area using the number of service area 8 read from the home memory station. . Note that the exchange 4 is a representative exchange that is normally ranked only once within the service area 8. After determining the switching center 4, the switching center 1 creates a representative search request signal for the switching center 4 and sends the signal via the data line to request a search. Thereafter, it waits for a response from the exchange 4, receives a search response signal, and ends the search request control.

The representative search request signal is composed of the subscriber number of the mobile device 9, the number of the service area 8, and information necessary for controlling signal transmission and reception. The search response signal is assembled from the subscriber number of the mobile device 9, the wireless line number on which the mobile device 9 is calling, and information necessary for signal transmission/reception control, and the search response signal is composed of the subscriber number of the mobile device 9, the wireless line number on which the mobile device 9 is calling, and information necessary for signal transmission/reception control. is not on a call), it is assembled with information to that effect.

Next, the search control of the exchange 4 which has received the representative search request signal will be explained. When the exchange 4 receives the representative search request signal, it determines the exchange belonging to its own service area 8. In making this determination, switching centers 5 and 6 are determined by indexing the memory that stores the numbers of switching centers belonging to the service area using the number of service area 8 included in the representative search request signal. Ru. After deciding,
Starts the wireless line search process for its own station, creates a search request signal for the exchanges 5 and 6, and sends it via the data line to request the exchanges 5 and 6 to perform the wireless line search process. Do the following.

The search request signal is composed of the subscriber number of the mobile device 9, the number of the service area 8, and information necessary for signal transmission/reception control inherited from the representative search request signal. Thereafter, it confirms the search results of its own station, waits for responses from the exchanges 5 and 6, and receives search response signals. A search response signal indicating that the wireless channel search was successful is received from the switching center 5 that accommodates the wireless station 51 with which the corresponding mobile device 9 is making a call. The signal is composed of a radio line number, a subscriber number of the mobile device 9, and information necessary for controlling signal transmission and reception. Further, the search for a wireless line for the local station 4 ends in failure because the mobile device 9 does not have a direct communication line with any of the wireless stations 41 to 4n accommodated in the local station 4, and the search response signal from the exchange 6 also fails. This is a signal of failure. When the representative exchange 4 receives the search response, it extracts the wireless line number and the subscriber number of the mobile device 9 included in the search response signal of the successful exchange 5, and creates a search response signal for the accepting exchange 1 using the information. Then, the search control is ended by sending it via the data line.

Exchange 4, which has received the search request from exchange 1 in this way, becomes the representative exchange, and serves the service area 8.
Performs search control within. That is, reception exchange 1
When transmitting and receiving signals to and from exchanges within the service area 8, a search is always performed via the representative exchange 4.

As explained above, the search request control of the switching center 1 and the search control of the switching center 4 make it possible to automatically search for a busy line.

Next, the difference in FIG. 3 from FIG. 2 is that the exchange 4 is a receiving station and also serves as a representative exchange. Its operation will be explained below.

The exchange 4 that has received the search request reads the number of the service area in which it is located in the same way as the exchange 1 explained in FIG. It does not perform any control, and its own station becomes the representative exchange and performs only search control. Then, the search result is known from the search response signal received from the exchange 5.

FIG. 4 is a relay connection diagram between a switching center and a radio station in the busy radio line search process according to the present invention, and shows the radio station where the relevant mobile device is located and its home memory station.

In FIG. 4, mobile device 107 is connected to wireless station 102.
If the network exists within the wireless coverage area of
01 → The call is being made through the call trunk. At that time, the wireless line used by the mobile device 107,
The communication lines between the wireless station and the switching center have a 1:1 correspondence.

The number of each line is determined so that it can be uniquely converted, and a memory for converting the wireless line number→call line number→radio line number is prepared in the switching center. At the time of the above call connection, the subscriber number of the mobile unit 107 and the line number of the corresponding call line 111 are stored in the mobile unit number storage unit 105 by the common device 103.

On the other hand, the above-mentioned search request signal from the representative switching center is received via the data line 106, and the common device 103 extracts the subscriber number of the mobile device 107 contained in the signal and sends it to the line search unit 104 for wireless line search processing. Leave it to me. Line search unit 10
4, the mobile device 107 inherited from the common device 103
The subscriber number of the mobile device is compared with the subscriber number of the mobile device stored in the mobile device number storage unit 105.
A match is found, and the telephone line number 111 stored in correspondence with the subscriber number is retrieved.

Furthermore, by searching the call line number→radio line number conversion memory using the retrieved line number of the call line 111, the wireless line number on which the mobile unit 107 is making a call is determined. By passing the determined wireless line number to the common device 103, the wireless line search process ends.

As explained above, the present invention realizes an automatic search for the radio line on which a mobile device is calling from an arbitrary switching center in a mobile communication system, and the search range is set within the service area of the mobile device. Limited to exchanges.

Automatic transmission and reception of search information A line number storage unit and a line search unit are provided.

By adopting this configuration, the verification target is limited to the active call line without comparing all the call lines, so the wireless line search time can be shortened, and the maintenance operation for the search can be simplified. There is.

[Brief explanation of the drawing]

FIG. 1 is a model diagram of mobile communication. Second
3 are diagrams of a busy line search method in mobile communication according to the present invention. FIG. 4 is a relay connection diagram between a switching center and a wireless station in the busy wireless line search process according to the present invention. 1, 2, 3, 4, 5, 6... Exchange, 11-1
n→61-6n...Radio station, 7...Service area, 8...Visit service area, 9...Mobile device,
101... Exchange network, 102... Radio station, 103... Common control device, 104... Line search unit, 105... Mobile device number storage unit, 106... Data line, 107... Mobile device,
108...Telephone trunk, 110-11n...Telephone line.

Claims (1)

[Claims] 1. In a mobile communication system consisting of a plurality of mobile switching control stations in each of a plurality of service areas, radio stations accommodated in correspondence with each mobile switching control station, and mobile devices moving in arbitrary service areas, An arbitrary mobile switching control station accepts a search request based on a mobile device number, and the reception switching center indexes the location information from the subscriber number of the mobile device to reach the service area where the mobile device is located. On the other hand, each mobile switching control station has a storage unit that stores the subscriber number of the mobile device and its corresponding line number at the time of connection, and a storage unit that stores the subscriber number of the mobile device and the corresponding line number at the time of connection, and It has a line search unit that matches the signal with the subscriber number of the mobile station stored in the storage unit, and the representative switching center searches for its own station and searches for all mobile switching control stations within its service area. Each mobile switching control station that has received this search request signal searches for the radio line number that the corresponding mobile unit is calling using the storage unit and the line search unit, and transmits the search results to the representative exchange. A busy line search method in mobile communication characterized by sending the data back to the reception switching center via the central office.